System Admin

C:\>help help
Provides help information for Windows XP commands.
 
HELP [command]
 
    command - displays help information on that command.

@echo off
setlocal enableextensions

if "%1" == "" (
	echo usage: which ^<command^>
	exit /b 1
)

if "%~x1" == "" (
	call :pathext %1 %PATHEXT%
) else (
	call :search %1
)

if %ERRORLEVEL% neq 0 echo %1 not found.
exit /b %ERRORLEVEL%

:pathext
	:loop
		call :search %1%2
		if %ERRORLEVEL% equ 0 exit /b 0
		shift /2
	if not "%2" == "" goto loop
	exit /b 1

:search
	if not "%~f$PATH:1" == "" (
		echo %~f$PATH:1
		exit /b 0
	) else (
		exit /b 1
	)